JP2010125964A - Rolling alarm device of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling alarm device that directly detects whether or not a wheel is in contact with the ground with a simple configuration and processing. <P>SOLUTION: The rolling alarm device 5 is provided with a section 6 for detecting axle displacement relative to the ground, a storage section 12, a determination section 14, a notification device section 7, and a notification control section 15. The unit 6 for detecting axle displacement relative to the ground successively detects a displacement of the axle relative to the ground corresponding to the height of the axle relative to the ground 20 on one side of the vehicle with respect to the width direction. The storage section 12 stores beforehand, as a reference distance of tire detachment from the ground, the axle displacement relative to the ground at the time when the wheel 2 on one side of the vehicle with respect to the width direction is detached from the ground 20 while the wheel 2 on the other side of the vehicle with respect to the width direction is in contact with the ground 20. The determination section 14 determines whether or not the displacement of the axle relative to the ground detected by the unit 6 for detecting axle displacement relative to the ground is equal to or larger than the reference distance of tire detachment from the ground stored in the storage section 12. The notification device section 7 and the notification control section 15 make a notification to the driver when the determination section 14 determines that the displacement of the axle relative to the ground detected by the unit 6 for detecting axle displacement relative to the ground is equal to or larger than the reference distance of tire detachment from the ground. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rollover warning device that gives notification according to the risk of rollover of a vehicle.

  When the vehicle at the time of cornering is greatly inclined to the outside of the corner due to centrifugal force, the wheels on the inner side of the corner may be separated from the road surface and roll over, so various devices for determining the risk of the vehicle rolling over are known.

  Two rollover prevention devices described in Japanese Patent Application Laid-Open No. 2005-239078 are arranged on the left and right sides of a vehicle via a distance W, and transmit ultrasonic waves, lasers, etc., and receive reflected waves to reduce the distance to the road surface. It has a ground distance sensor to measure, calculates the amount of change in distance measured by the ground distance sensor from the state where it is traveling on a horizontal plane, and calculates the difference in distance change measured by the left and right ground distance sensors as distance W Divide to calculate the vehicle tilt (detected value), and calculate the vehicle tilt (front wheel) or vehicle tilt (rear wheel) by dividing the difference between the left and right suspension strokes of the front or rear wheels by the tread length. Then, it is detected that the difference between the vehicle inclination (detected value) and the vehicle inclination (front wheel) or the vehicle inclination (rear wheel) is equal to or greater than a predetermined value, thereby detecting that the wheel is disengaged.

  The steering force control apparatus described in Japanese Patent Application Laid-Open No. 2004-9812 detects the distance between the vehicle and the road surface using a laser sensor or a millimeter wave radar, and whether the detected distance between the vehicle and the road surface is a predetermined value or more. Determine whether. When the distance between the vehicle body on the right side of the vehicle and the road surface is equal to or greater than the predetermined value, a left turn steering force is added. When the distance between the vehicle body on the left side of the vehicle and the road surface is equal to or greater than the predetermined value, a right turn steering force is added. .

Japanese Patent Laid-Open No. 2005-239078 Japanese Patent Laid-Open No. 2004-9812

  By the way, in order to determine the risk of rollover of the vehicle, it is preferable to directly detect whether or not the wheels are in contact with the road surface.

  Japanese Patent Laid-Open No. 2005-239078 detects that the difference between the vehicle inclination (detected value) and the vehicle inclination (front wheel) or the vehicle inclination (rear wheel) is equal to or greater than a predetermined value. Although it is described that it can be detected that the vehicle has taken off, it is determined based on the indirectly calculated value without directly detecting whether or not the wheel has taken off. It is difficult to judge. In addition, since it is necessary to detect the inclination of the vehicle (detected value) and the inclination of the vehicle (front wheel) or the inclination of the vehicle (rear wheel), the configuration becomes complicated and the processing becomes complicated.

  Moreover, the structure of Unexamined-Japanese-Patent No. 2004-9812 determines whether the vehicle has a rollover tendency, and cannot detect whether the wheel is earth | grounded on the road surface.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a rollover warning device capable of directly detecting whether or not a wheel is in contact with a road surface with a simple configuration and processing. To do.

  In order to achieve the above object, a vehicle rollover warning device according to the present invention comprises axle ground displacement detection means, storage means, determination means, and notification means.

  The axle ground displacement detection means sequentially detects the axle ground displacement corresponding to the height of the axle on one side in the vehicle width direction with respect to the road surface. The storage means stores in advance, as a tire take-off reference distance, a displacement from the axle to the ground when the wheel on the other side in the vehicle width direction is grounded and the wheel on the one side in the vehicle width direction leaves the road surface. The determination means determines whether or not the axle ground displacement detected by the axle ground displacement detection means is equal to or greater than a tire take-off reference distance stored in the storage means. The notification means notifies the driver when the determination means determines that the axle ground displacement detected by the axle ground displacement detection means is equal to or greater than the tire take-off reference distance.

  In the above configuration, since the axle ground displacement detecting means detects the axle ground displacement corresponding to the height of the axle with respect to the road surface, whether the wheel supported by the axle is in contact with the road surface with a simple configuration and processing. Can be detected directly.

  In addition, when the wheel on the other side in the vehicle width direction is in contact with the ground, the storage means stores the axle ground displacement when the wheel on the one side in the vehicle width direction separates from the road surface, so that the determination by the determination unit is possible. Specific reference values can be used.

  According to the present invention, it is possible to directly detect whether or not the wheel is in contact with the road surface with a simple configuration and processing.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  1 is a schematic view of a vehicle equipped with a rollover alarm device according to an embodiment of the present invention as viewed from the rear, FIG. 2 is a block diagram of the rollover alarm device of FIG. 1, and FIG. 3 is a rollover of FIG. 4 is a flowchart showing the processing of the alarm device, FIG. 4 is a graph showing the relationship between the turning lateral acceleration of the rollover warning device of FIG. 1 and the axle ground displacement on the inside and outside of the turning, and FIG. It is the schematic which shows the state in which the axle ground displacement became more than the tire take-off reference distance.

  As shown in FIG. 1, the vehicle 1 according to the present embodiment is a truck, and includes left and right wheels 2 (outer wheels 2 a and inner wheels 2 b), an axle case 4, and a rollover warning device 5. Note that the left and right in the following description indicate the left and right in the vehicle width direction when the vehicle 1 is viewed from the back as shown in FIG.

  Each wheel 2 has a tire 3. FIG. 1 shows the rear wheel, and the illustration of the front wheel is omitted.

  The axle case 4 accommodates an axle (not shown) that supports the wheel 2.

  As shown in FIG. 2, the rollover warning device 5 includes an axle ground displacement detection unit 6, a notification device unit 7, and a controller 10.

  The axle ground displacement detection unit 6 constitutes an axle ground displacement detection means, is attached to the axle case 4 and corresponds to the height of the axle with respect to the road surface 20 on both outer sides in the vehicle width direction (near the inner side of the inner wheel 2b). Displacement is detected sequentially. Specifically, two axle ground displacement detectors 6 are arranged in the vehicle width direction, fixed one by one to the left and right vehicle width direction outer portions of the axle case 4, and have laser displacement meters that detect distances. The laser displacement meter detects the distance to the road surface 20 as the axle ground displacement, and outputs the detected axle ground displacement.

  The axle ground displacement detection unit 6 may be anything that detects the axle ground displacement corresponding to the height of the axle with respect to the road surface 20, and may use an ultrasonic displacement meter or the like that detects a distance.

  The notification device unit 7 includes a display device 8 and a speaker 9.

  The display device 8 is arranged on an instrument panel (not shown) in the vehicle, and is attached with identification information indicating that the vehicle 1 may roll over to the driver (printed with characters and symbols). When a predetermined voltage is applied, a lamp that is normally turned off is lit when a specific resin plate and a lamp disposed on the back side of the resin plate are provided.

  The speaker 9 is disposed in the vehicle and generates a warning sound when a predetermined voltage is applied.

  The controller 10 includes a ROM (Read Only Memory) 11 and a CPU (Central Processing Unit) 13.

  The ROM 11 has a storage unit 12. The storage unit 12 constitutes storage means, and in the state where one wheel 2 in the vehicle width direction is in contact with the ground, the displacement of the other axle 2 in the vehicle width direction when the other wheel 2 in the vehicle width direction separates from the road surface 20 Stored in advance as a distance.

  Specifically, the axle-to-ground displacement detection unit 6 detects in advance the axle-to-ground displacement when the other wheel 2 in the vehicle-width direction leaves the road surface 20 in a state where one wheel 2 in the vehicle-width direction is in contact with the ground. The ground displacement is stored in the storage unit 12 as a tire take-off reference distance. In the present embodiment, since the height of the left and right axle ground displacement detector 6 and the distance from the wheel 2 are provided at the same position, it is common to the axle ground displacement detected by the left and right axle ground displacement detector 6. The tire take-off reference distance is memorized and used.

  Note that the tire take-off reference distance is not limited to calculation based on experiments, but may be a value calculated based on the structure of the vehicle 1. In addition, when the left and right axle ground displacement detection units 6 are provided at different heights or distances from the wheels 2, the tires are different from the axle ground displacements detected by the left and right axle ground displacement detection units 6, respectively. The take-off reference distance may be stored and used.

  The CPU 13 includes a determination unit 14 and a notification control unit 15. The determination unit 14 constitutes a determination unit. The notification control unit 15 constitutes a notification unit together with the notification device unit 7.

  The determination unit 14 receives the axle ground displacement detected by the left and right axle ground displacement detection units 6. The determination unit 14 determines whether or not the axle ground displacement detected by the left axle ground displacement detection unit 6 is greater than or equal to the tire takeoff reference distance, and the axle ground displacement detected by the right axle ground displacement detection unit 6 is the tire takeoff reference. It is determined whether or not it is greater than the distance.

  In the present embodiment, the determination unit 14 determines that at least one of the axle ground displacements detected by the left and right axle ground displacement detection units 6 is greater than or equal to the tire take-off reference distance. However, the present invention is not limited to this, and the axle ground displacement detected by one axle ground displacement detector 6 is equal to or greater than the tire take-off reference distance, and the other axle ground displacement detector 6 It may be determined whether or not the detected axle ground displacement is less than the tire take-off reference distance. Thereby, it is possible to detect whether or not the other wheel 2 in the vehicle width direction is away from the road surface 20 in a state where one wheel 2 in the vehicle width direction is grounded.

  When the determination unit 14 determines that the tire take-off reference distance is greater than or equal to the tire take-off reference distance, the notification control unit 15 applies a predetermined voltage to the notification device unit to turn on the lamp of the display device 8 and generates a warning sound from the speaker 9. Let

  In the present embodiment, the notification device unit 7 and the notification control unit 15 perform the same notification even when the determination unit 14 determines that the left and right wheels 2 are separated from the road surface 20, but the left and right wheels 2 Even if the determination part 14 distinguishes and determines which wheel 2 has left | separated from the road surface 20, according to the determination which the determination part 14 distinguished, the alerting | reporting apparatus part 7 and the alerting | reporting control part 15 may alert | report a driver in a different aspect. Good. That is, when the axle ground displacement detected by the right axle ground displacement detector 6 is greater than or equal to the tire take-off reference distance, and when the axle ground displacement detected by the left axle ground displacement detector 6 is greater than or equal to the tire take-off reference distance. The determination unit 14 determines whether the right wheel 2 has moved away from the road surface 20, and the determination unit 14 determines that the left wheel 2 has moved away from the road surface 20. The device unit 7 and the notification control unit 15 may notify the driver in different modes. For example, the display device 8 is provided with identification information indicating that the left and right wheels 2 are separated from the road surface 20 and a corresponding lamp, and the notification control unit 15 is provided with the display device 8 according to the determination of the determination unit 14. May be lit, or a warning to the driver that the right or left wheel 2 is away from the road surface 20 or a method of avoiding a state of rollover (deceleration or steering direction). The voice of the content instruct | indicating to a driver | operator may be previously memorize | stored in ROM11, and the structure which the alerting | reporting control part 15 alert | reports the memorize | stored voice from the speaker 9 may be sufficient. Thereby, when there is a possibility that the vehicle 1 may roll over, it is possible to prompt the driver to perform an accurate driving operation for avoiding the roll over of the vehicle 1.

  Next, processing executed by the rollover warning device 5 will be described based on the flowchart of FIG. This process is executed every predetermined time (for example, every 5 msec) while the vehicle 1 is traveling.

  In step S <b> 1, the axle ground displacement detected by the left and right axle ground displacement detection units 6 is input to the determination unit 14.

  In step S2, the determination unit 14 determines whether or not the respective axle ground displacements detected by the left and right axle ground displacement detection units 6 are equal to or greater than the tire take-off reference distance. If the determination unit 14 determines that the axle ground displacement detected by the left or right axle ground displacement detection unit 6 is greater than or equal to the tire take-off reference distance, the process proceeds to step S3. If the determination unit 14 determines that none of the axle ground displacements detected by the left and right axle ground displacement detection units 6 is equal to or greater than the tire take-off reference distance (the axle ground displacement is less than the tire take-off reference distance), this process is performed. finish.

  In step S <b> 3, the notification control unit 15 applies a predetermined voltage to the notification device unit 7 to turn on the lamp of the display device 8 and generate a warning sound from the speaker 9. Notify that there is.

  Next, a case where the vehicle 1 may roll over will be described. When the vehicle 1 turns, a centrifugal force to the outside of the turn acts, and a turning lateral acceleration is generated in the vehicle 1. For example, the turning lateral acceleration increases when the turning radius is small, and increases when the vehicle speed is high. When the vehicle 1 is tilted outward by the turning acceleration, the wheel 2 inside the turning may leave the road surface 20 and the vehicle 1 may roll over.

  The graph of FIG. 4 shows an example of the relationship between the turning lateral acceleration, the turning-side axle ground displacement, and the turning-side axle ground displacement when the turning inner wheel 2 moves away from the road surface 20 by turning.

  Here, the tire 3 of the wheel 2 is bent by the vehicle weight. For this reason, in the state of a1 where the turning lateral acceleration is small, the inclination of the vehicle 1 is small, the amount of tire deflection (hereinafter referred to as tire deflection amount) is small, and the wheel 2 on the inside of the turning does not leave the road surface 20.

  In the state of a2 where the turning lateral acceleration is large, the inclination of the vehicle 1 is large, the amount of tire deflection is reduced, and the axle ground displacement inside the turning is increased. In the state of a1 and the state of a2, since the left and right wheels 2 are in contact with the ground, the risk of the vehicle 1 rolling over is low.

  Then, in the state of a3 where the turning lateral acceleration is larger, the amount of tire deflection is eliminated, the wheel 2 inside the turning is separated from the road surface 20, and the axle ground displacement becomes equal to or greater than the tire take-off reference distance as shown in FIG. In the state a3, the vehicle 1 may roll over.

  By the way, the relationship between the turning lateral acceleration of the vehicle 1 and the displacement of the axle with respect to the ground is not always the relationship shown in the figure. It depends on various factors. For this reason, it is difficult to detect the turning lateral acceleration and determine the risk of rollover based on the detected turning lateral acceleration.

  In the present embodiment, the axle-to-ground displacement detecting unit 6 detects the displacement from the axle corresponding to the height of the axle with respect to the road surface 20, so that the wheel 2 supported by the axle is grounded to the road surface 20 with a simple configuration and processing. It is possible to directly detect whether or not.

  Further, the storage unit 12 stores, as a tire take-off reference distance, a displacement from the axle to the ground when the wheel 2 on one side in the vehicle width direction is separated from the road surface 20 with the wheel 2 on the other side in the vehicle width direction being in contact with the road surface 20. Thus, a specific reference value can be used for the determination by the determination unit 14.

  When one wheel 2 in the vehicle width direction is in contact with the road surface 20 and the other wheel 2 in the vehicle width direction is separated from the road surface 20, the axle ground displacement detected by the left or right axle-to-ground displacement detector 6 is The determination unit 14 determines that the tire reference distance is equal to or greater than the tire reference distance, and the notification device unit 7 and the notification control unit 15 notify the driver. Thereby, the driver can know that the wheel 2 has left the road surface 20. If the driver appropriately performs a driving operation such as deceleration or steering in accordance with the notification, the rollover of the vehicle 1 can be avoided in advance.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

It is the schematic which looked at the vehicle provided with the rollover warning apparatus which concerns on embodiment of this invention from back. It is a block block diagram of the rollover alarm device of FIG. It is a flowchart which shows the process of the rollover warning apparatus of FIG. It is a graph which shows the relationship between the turning lateral acceleration of the rollover alarm device of FIG. 1 and the axle ground displacement inside the turning and outside the turning. It is the schematic which shows the state in which the axle ground displacement of the vehicle of FIG. 1 became more than the tire take-off reference distance.

Explanation of symbols

1: vehicle 2: wheel 4: axle case 5: rollover warning device 6: axle ground displacement detection unit 7: notification device unit 12: storage unit 14: determination unit 15: notification control unit 20: road surface

Claims (1)

Axle-to-ground displacement detecting means for sequentially detecting the axle-to-ground displacement corresponding to the height of the axle on one side in the vehicle width direction,
Storage means for preliminarily storing, as a tire take-off reference distance, the axle ground displacement when the wheel on the other side in the vehicle width direction is grounded and the wheel on the one side in the vehicle width direction leaves the road surface;
Determination means for determining whether or not the axle ground displacement detected by the axle ground displacement detection means is greater than or equal to the tire take-off reference distance stored in the storage means;
A vehicle rollover comprising: a notification means for notifying a driver when the determination means determines that the axle ground displacement detected by the axle ground displacement detection means is greater than or equal to the tire take-off reference distance. Alarm device.

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